Malicious PDF — malware analysis report

Static analysis result for SHA-256 13523e2676ffc0bc…

MALICIOUS

PDF

72.3 KB Created: 2021-05-10 08:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a542fbdb24bf861bf33d5b117a248ad SHA-1: 954f46d3a9125383a1275e4c4ee4403f055abd1d SHA-256: 13523e2676ffc0bcbb341c0880cf1bc7a94b13127a7f77beb41282986d03b33d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf142f2875---dapixironinovisofer.pdf
    • http://allaboutdowney.com/userimages/pimafewenafodikinujik.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607010e934c09---12533407139.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/451621c395a417c2bf094cf3c84d54bb/24365292820.pdf
    • http://archerelectricsupply.com/userfiles/file/32427319547.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a32189c2f---83405857691.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/059064b4d1ca6e72d99e650adac43643/bekoletogipum.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/uv7av5far091olgtf6mqrn0oh2/matizekuw.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078323e3d478---waveveragugubuzokuzaxo.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607608ef78cd6---gimowejerimodedukile.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4c0142457---nojaxisaxanimimulugox.pdf
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/f8db249978898abbef325d4357541642/18852234444.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/dd9142211d2f232d4d7ccbf5277c3668/93854480251.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/f67r331igqnfoefuuctrgvvoos/97983086081.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=anki+like+app+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d22f.bin
ab704ea4b2a74902c69979741d94b6522f01a9c67d997ff0c3e1e2ead40f06b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD22F 4620 bytes
font_01_sfnt_off0000e1e2.bin
7b723b163510c88ee6d4c3bcd2dce983fbdbf8193ea2dfa75a83b894f86e1c80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E2 10592 bytes
font_02_sfnt_off000105e7.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E7 4324 bytes

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